Pitman



(No Model.)l S. ARNOLD. PITMAN.

No. 422,489. Patented Mar. 4, 1890.

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UNITED STATES PATENT OFFICE;l

SATTERLEE ARNOLD, OF MORRISTOIVN, NEV JERSEY, ASSlGrNORl TO ANNA M. ARNOLD, OF BROOKLYN, NEY YORK.

PITMAN.

SPECIFICATION forming part of Letters Patent No. 422,489, dated March. 4, 1890.

Application filed October 28, 1888. Serial No. 288,967. (No model.) Patented in England February 28, 1888, No. 2,999, and in France February 28, 1888, No. 189,026.

To all whom it may concern:

Be it known that I, SATTERLEE ARNOLD, a citizen of the United States, residing at Morristown, in the county of Morris and State of New Jersey, have invented certain new and useful Improvements in Pitmen or Links, (for which I have obtained a patent in Great Britain, No. 2,999, dated February 28, 1888, and in France, No. 189,026, dated February 1c 28, 1888,) of which the following is a specification, reference being hadtherein to the accompanying drawings.

The object of my invention'is to provide an improved pitman, link, or connecting-rod of I 5 such construction that the working length thereof may be readily adjusted to compensate for any wear which may occur between the parts to be connected.

y My improved pitman or link is more eszo pecially intended to serve as a connection between the various parts of sewing-machines, but maybe advantageously employed in other machines where it is desirable to use an adjustable connection toI compensate for wear `2 5 or for any other purpose.

In the drawings, Figure 1 is a plan View of one form of my improved pitinan or connecting-rod. Fig. 2 is a sectional View of the same, showing also parts to be connected 3o thereby; and Figs. 3 to 11, inclusive, illustrate other forms ofmy invention.

A denotes the body or strap of the pitman or link, provided near its ends with openings or recesses to receive the parts to be con- 3 5 nected. In Fig. 2, b represents a ballshaped eccentric on a sewingmachine drivingshaft, and c the ball-pin of the needle-operating lever, said part-s being received in said openinos..

lhe body or strap A is of proper form to receive two bearing bars or blocks d, which are longitudinally adjustable therein, said bars or blocks having at their1 outer ends concave seats n. The seats a in the body A opposite the seats a of the bars or blocks c7, will of course be hollowed out, as shown in Figs. 2, 3, 5, y6, and 7, if the pitinan be designed to receive rounded or ballshaped parts such as are shown in Fig. 2, and the seats n of the said bars or blocks will in such instance be 5o of corresponding form; but where the bearings or parts to be connected are cylindrical the seats in the pitman-body A and bars or blocks d will be straight or cylindrical, as shown in Fig. 4.

The bars or blocks d are preferably adj usted simultaneously by a screw f, having a conical head or `portion bearing against the inner ends of the said bars or blocks, said ends be ing shaped to conform to the shape of the conical part of the screw. The stem of the screw may be tapped in the body A of the pitman, as shown in Figs. 1 to 6, inclusive, or in an independent sliding nut or collar c, received in a slot or opening h in said body, as in Figs. 7 and 8. The nut or collar c centers or adapts itself to unequal wear of the bars d or the parts connected by the pit'man. By turning the screw in it will be obvious that the bars or blocks (l will be forced outward by the conical head or portion of thel screw, and when the proper adjustment of the lata ter is secured it is held in placeby aset-nut g.

Instead of simultaneously adjusting the bearing bars or blocks cl by a single screw, two screws, one for each bar, may be employed, if desired, as shown in Fig. 3, thus rendering the bars adjustable independently of each other. In cases where the Wear of the two crank-pins or other parts to be connected by the pit-man is likely to be unequal this independent adjustment of the bars or blocks d may be preferable. The bars or blocks d fit somewhat loosely in the recess of the body of the pitman, so that the seats at the'outer ends of said bars or blocks can readily adjust themselves to the parts against which they bear. j

The forms of myinventou shown by Figs. 5, 6, 7, and 8 represent short pitinen or links which may be used for avariety of purposes. In these forms of my invention the bars or blocks d of each link are both adj usted by a single screw, the conical or adjusting portion of the screw being at the head thereof in one instance and at the point in the other.

In the device shown in Figs. 7 and 8 the screw f is tapped through the sliding nut or collar e, as above stated, said nut or collar fitting somewhat loosely in the slot h, extending longitudinally of the strap or body A of the pitman, so that when the said nut or collar is not secured in place by the set-nut g it can center or adjust itself to accommodate unequal wear of the parts connected by the pitman or link. This nut 0r collar e has ai iiange e', which is forced against the `inner wall of the strap or body of the link or pity man to hold the said nut or collar in placeiwhen the said set-nut g is tightened. The bars or blocks d in this form of my invention are guided in a longitudinal groove t' in the stra-p or body of the pitman or link, and may? be prevented from falling out of the said g strap or body when loose by small pins k.. Itewill be obvious that with this Vform of my. invention I secure lall of the practical re-. suits of the independent adjustment of the bearing blocks or bars aiforded by the two` adjusting-screws shown in Fig. 3, and that the nut or collare when loosened will center or adjust itself in the `longitudinal ways in? the bodyA formed by the sloth in such a manf ner as to accommodate unequal wear of the adjustable bars or blocks d or the 4parts connected by Athe link or pitman. This same re sult of a self centering adj usting devicel might .also be effected by a cam or eccentric 7', arranged to bear against 4the inner ends of the bearing bars or blocks d, and providedl with `self-centering journals or trunnions 0",L fitting loosely in slots 71, inthe body or strap. of the pitinan, and having also set-nuts g.. (See Figs. 9,10, and 11.) By loosening one:4 of said set-.nuts the cam or eccentric r will beiv free to be turned by a screw-driver inserted in a nick in one of its trunnions `to set up the blocks d, the slots h permitting the cam or eccentric to center itself lengthwise of the pitman to provide for unequal wear of the` balls or parts against which the blocks clbear at their outerends. A Iam aware of the pitman shown by United. States Patent No. 210,646, in which two bearr ing blocks or bars are simultaneously forced outward for the purpose of automatically taking up wear by a spring-pressed wedge, and I do not, therefore, claim a pitman having two silnultaneously-lnovable bars, broadly; but

What I do claim, and desire to secure by Letters Patent, is-

l. In a pitman, the combination, with 4the recessed strap or body port-ion thereof, of two positively-adjustable bearing blocks or bars received' in said strap or body portion and provided at their outer ends with seats to en gage the parts to be connected, and a selfcentering adjusting device movable or ad'- justa-ble lengthwise of said strap or body, and thus adapted to compensate for unequal wear of the parts connected.

2. In a pitman, the combination, with the recessed strap or body portion thereof, of `two bea-ring blocks or bars received in the said strap or body portion `and provided at their outer ends with concave seats .toengage the parts to be connected, and an adj usting-serew having a conical portion to adjust the bar or bars with which it is in contact, substantially as set forth.

3. In a pitman, :the combination, with the recessed strap or body portion thereof, of two bearing blocks or bars received in thesaid strap or body portion andfprovided at their outer ends with concave seats to-engage the part-s to be connected, an adj usting-screw having a conical portion,:and a set-nutto hold the said screw in any-position to-which-it may be adjusted, as set forth.

4. In a pitman, thecombination, withA the recessed strap or body portion thereof, 4of two bearing `blocks or Ibars received in the said strap or body portion, an ad justin g-screw l1aving a conical part, and a sliding for `movable nut, through which `the said screw is tapped, as set forth.

In testimony whereof I affix mysignaturcin presence of two witnesses.

SATTERLEE ARNOLD. Witnesses:

Timo. F. WHITE, Jr., ALBERT E. CUTHBERT. 

